Docs should mention that package sources don't make it into core metadata and are hence ignored by Pip

[smheidrich]

Issue Kind

Improving documentation

Existing Link

https://python-poetry.org/docs/repositories/#package-sources

Description

Poetry's package sources are ignored completely when installing a Poetry package using Pip instead of Poetry, whether normally or in editable mode. This must be so, because the core metadata specification used to specify a wheel's dependencies (including those of ephemeral wheels for editable installs) has no concept of specifying indexes as package sources.

As far as I can tell, the current docs on package sources (1, 2) don't mention this at all.

[finswimmer]

Feel free to submit a PR. We are always happy to see improvements in the docs 😀

[github-actions]

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